^Wilayat and leadership of Imam Ali was prescribed by the God and his Messenger. Thus, there is absolutely no comparision between him and the other man-made kings who came to power by deceit, lies, and force.
Thats your faith and does nto stand to reason and logic. While you have every right to beleive in whatever you want to beleive, there is no evidence that rule of Imam Ali was better than those of Abu Bakr ra and Omer ra and the historians of the world testify to that.